And glxgears is not a fair tool for comparing too cards, or comparing anything. Its results are not useful for comparing anything other than saying that you got that number at that moment in time. Beyond that glxgears is little more than eye candy.

but UT2004 (as example) is. and my fps is 3times faster comparing UT2004 windows <> linux.
btw, that is not the case with my FX5200LE. fpsrates in UT2004 are almost equal there comparing windows/linux.
thats why i guess we have a driver problem here..